Steam-engine



(Model.)

2 Sheets-Sheet l. I E. C. JOHNSON.

STEAM ENGINE.

No. 453,643. Patented June 9,1891.

(Model.) 2 sheets-sheet 2.

E. C. JOHNSON. STEAM ENGINE No. 453,643. Patented Jun@v 9, 189,1.

UNITED STATES PATENT OFFICE.

EDVARD C. JOHNSON, OF KEOKUK, IOVA.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 453,643, dated J une 9, 1891.

Application iiled September ll, 1890. Serial No. 364.665. (Model) To all whom t may concern:

Be it known that l, EDWARD C. JOHNSON, residing at Keokuk,in the Stateof Iowa, have invented certain new and ustul Improvements in Steam-Engines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to cycloidal engines having vertical cylinders. Tl e engine illustrated has a single cylinder and single-acting piston.

The object of the invention is to produce a cycloidal engine with connections from the piston to the driving-shaft and a guidingfulcrum from which the piston swings in its movement, and also to improve the construetion of the engine and casing.

Figure l is a plan of the engine, part of the piston-head or cover being broken away. Fig. 2 is a vertical section through the center of the piston and casing. Fig. 3 is a detail of the link. Fig. 4 is a section of the piston and gear, partly broken away. y Fig. A is a bottom plan of the piston. Fig. 6 isa top plan of cylinder, partly broken away.

The reference-letter @indicates the supporting-base of the engine, and b the cylinder supported thereon. The cylinder h has an outer annular casing c with a steam-chest d at one side and an inner ring of the saine height as the casing. The inner circular chamber f may be empty or steam may be permitted to enter, so as to balance the piston. The rings c and e are connected at the side of the casing next the steam-chest by the partition h, which partition crosses the chamber g. The outer upper edge of the ring c has a iiange e' to receive the cylinder head or cover k. A ring or broken hollow cylindrical piston m enters the chambers g, the width of the ring being the same as that of the walls e c and its diameter such that when placed in chamber c the outer face of the ring will rest against the outercasing cat one side,whilethe inner face of the ring rest-s against ring or wall e at the other side of the engine. The ring m is broken, leaving a space n a little wider than the thickness of partition h, and a disk 0 surmounts the ring and projects at each side thereof. The disk 0 is surmounted by a cover k, which o. The steam-space outside the packing-ring r above the disk should about equal the under surface of said disk exposed to pressure, so that the piston will be balanced.

The central part of piston-disk o has an annular internal gear-piece s secured thereto concentric to the disk o. The shaft t has its bearings if in cross-bars u above the cover. The bearing t is long to relieve the shaft t from tendency to cramp. The end of shaft t next the disk o has a pinion V attached.

The piston-disk o has an upwardly-projecting pin w, which enters one end of a swinging link fr, the other end of the swinging link being pivoted to the cover p by a pivot y. The piston-ring m is eccentric to the chamber g. Chamber g has an entrance-port d and an exhaust-port d2 through the steamchest d. The^'steamchest d has a port d3, through which steam enters. The steam bears the piston-ring across the chamber g. Steam enters said chamber irst outside and then inside the ring m,bearing on the ring and rocking disk o about partition h, the link connecting the piston to the fulcrum y. The oscillating movement of the disk o causes the teeth of gear s to engage the teeth of gear V and drive said gear V and the shaft t. The engagement of the teeth of gear s with gear V is continuous, but the teeth engage only on one side at atime. The gear sha-s more teeth than gear V (being larger in diameter) and each oscillation of the disk 0 moves the gearV one tooth. Gear V being attached to shaft t, said shaft will turn with said gear.

The disk o overhangs ring c so far that the edge of said ring is covered when disk o moves with its ring-piston across the casing. The steam enters space s3 above the disk and between the outer edge of cover lo and the ring q, serving to balance the pressure on disk o. The steam passes from the outer to the inner side of ring m alongside the partition h, or ports may be made through the ring near the space n.

The single-acting engine is very simple. A compound cycloidal engine of the vertical type may also be made.

Vhat I claim is- 1. In a steam-engine, the gyrating cycloidal broken piston-ring attached to a disk and working eccentrically in a divided annular iixed chamber or cylinder and a ring connected to the cover and bearing on this disk, substantially as described.

2. The combination of the fixed cylinder and gyrating piston, substantially as described, the cover, and a ring secured to the cover and having its edge covered by a packing and supported by a ange attached to the cover, so as to bear on the head of the piston, substantially as described.

3. The combination of the divided annular steam-chamber, the broken-ring piston secured to a disk and resting in said chamber, and a link pivoted to said disk and to the cover and serving as a guiding-fulcrum, substantially as described.

4. The combination, with the divided cylinder, 0f the broken-ring piston therein and attached to a disk covering said cylinder, and a movable link pivoted to the disk and cover or casing, substantially as described.

5. The combination of the divided annular iixed cylinder, broken-ring piston attached to a disk overlying the cylinder and gyrating therein, a ring-cover over the outer edge of the piston-disk, and a ring Within the cover, bearing on the disk.

G. The divided annular fixed cylinder, the broken-ring piston arranged to gyrate therein, and a gear attached to the gyrating piston and arranged to engage another gear on a suitable support or drivingshaft, substantially as described.

7. The divided annular fixed cylinder, the l broken-ring piston eccentric to said cylinder and having a disk provided with an internal gear, and a shaft concentric with the cylinder, supported in bearings above the disk and having a pinion thereon, substantially as described.

In testimony whereof I affix my signature in presence of two Witnesses.

EDIVARD C. JOHNSON. Witnesses.-

XV. A. BARTLETT, PHILIP MAURO. 

